One of the great new features in 5.2 is the ability to take over the Sunsong Ranch farm in the Valley of the Four Winds. You can do this by talking to Nana Mudclaw after reaching Exalted with The Tillers, and unlocking all 16 plots of the farm. When you take over the farm you can begin taking work orders for specific factions in Pandaria, allowing you to earn reputation with them simply by planting, harvesting, and delivering the items you grow.

The way your receive work orders on the Sunsong Ranch farm was changed recently which may cause some confusion. If you've been doing your work orders you probably have logged in and had the second work order in the series automatically pop-up in your quest list. This has been changed, and from now on you’ll receive the quest when you start harvesting your plants, or when you interact with the drop-off crate.